BuffHandler Kotlin

package gg.rsmod.game.model.buffs

import gg.rsmod.game.model.entity.Pawn
import gg.rsmod.util.ticks
import java.util.concurrent.TimeUnit

class BuffHandler(val pawn: Pawn) {

    var timers = mutableListOf<BuffTimer>()

    fun add(buff: Buff, time: Int = -1) {
        val time = if (time == -1) buff.time else time

        if (time == 0) return

        timers.removeIf { it.buff.override && (it.buff.id == buff.id || it.buff.type == buff.type)}

        val timer = BuffTimer(buff, time.ticks(TimeUnit.SECONDS))
        timers.add(timer)
        TODO("Display buff for player with seconds remaining")
    }

    fun remove(buff: Buff) {
        buff.onEnd(pawn)
        timers.removeIf { it.buff.id == buff.id }
        TODO("Remove buff from displayed buffs for player")
    }

    fun reset() {
        timers.forEach { it.buff.onEnd(pawn) }
        timers.clear()
        TODO("Remove buffs from displayed buffs for player")
    }

    fun resetTransient() {
        timers.filterNot { it.buff.persistent }.forEach { it.buff.onEnd(pawn) }
        timers.retainAll { it.buff.persistent }
        TODO("Remove buffs from displayed buffs for player")
    }

    fun isActive(timer: BuffTimer): Boolean {
        return timers.contains(timer)
    }

    fun cycle() {
        timers.forEach {
            if (--it.ticks <= 0) {
                remove(it.buff)
                it.buff.onEnd(pawn)
            }
        }
    }

}